Wheel or disk for steam-engines.



PATENTED AUG. 25, 1 903.

J. STUMPF. WHEEL OR DISK FOR STEAM ENGINES.

APPLIGATION FILED APR. 3. 1903.

no MODEL.

Inventor W'Ltnesses- {M ,1 Q

Attorn ym: Noam: PETERS co. moYoumn. WASHINGTON. n, c

Patented August 25, 1903.

, PATENT OFFICE.

JOHANN STUMPF, OFBERIJIN, GERMANY.

WHEEL OR DISK FOR S TEAM-ENGINES.

SPECIFICATION forming'part of Letters ram NQ.'737,042, dated August 25,1903.

Application filed April 3. 1903.

To all whom it may concern:

Be it known that I, JOHANN STUMPF, a subject of the German Emperor, residing at 27 Rankestrasse, Berlin, Germany, have invented certain new and useful Improvements Relating to the Wheels or Disks of Steam- Turbines, of which the following is aspecification.

In steam-turbines which are f urnished-with relatively large wheels the radiation of heat from the casing indicates a temperature of the rim of the wheel which is very considerably higher than the temperature of the disk or web of the wheel. If steam is introduced into the casing of a somewhat high pressure, the rim of the wheel becomes of a temperature of 150 and more, as trials have confirmed, while the disk or web of the Wheel has the temperature corresponding to that of the condenser, which amounts to about from to Afurther increase of temperature ofthe rim of the wheel results fromthe friction of the steam on the blade-surfaces. The superheating resulting from the friction on the wall of the casing is transmitted partly to the steam, but also partly to the wheel. In practice with such turbine-wl1eels splits and cracks result, and in order to prevent the durability. of the whole turbine being endangered thereby therim of the wheel according to the present invention is allowed to expand or to eX- tend. This is effected in the simplest manner by the provision of incisions on the rim of the wheel at certain distances apart, determined according to the dimensions and the Serial Nol50,944=. (No model.)

metal of the turbine-wheel as well as to the temperatures involved.

The accompanying drawings; represent in Figures 1 and 2 a partial cross-section and partial elevation of a turbine-wheel provided according to the invention. In the drawings a comparatively thin disk a has the rim 1) overhanging on each side, and on the circumference of the rim blades 0 are indicated. On the rim at certain distances apart radial incisionsor saw-cuts d are provided, which terminate in transversely-bored holes f in the disk a. y

' The invention is not limited, of course, to the particular kind of turbine employed nor to the shape or disposition of the blades, while the invention is, moreover, applicable to turbines of any system in which wheels, cylinders, or their equivalent are employed for mounting and carrying the moving blades.

What I claim as my invention, and desire to secure by Letters Patent, is

A steam-turbine wheel having the rim constituted of. a number of separate segmental parts, free spaces between the said parts, and

blades or vanes intermediate of said free spaces, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

JOHANN s'rU PF. 

